View Compilation Error

0_0_36761771_31867.cpp: In function 'int main()':
0_0_36761771_31867.cpp:11:34: error: 'isalpha' was not declared in this scope
             putchar((isalpha(t[i]) && t[i-1] == ' ') ? toupper(t[i]) : t[i]);
                                  ^
0_0_36761771_31867.cpp:11:68: error: 'toupper' was not declared in this scope
             putchar((isalpha(t[i]) && t[i-1] == ' ') ? toupper(t[i]) : t[i]);
                                                                    ^